1926: Stalin attacked the 'United Opposition' of Zinoviev, Kamenev, and Trotsky at the 15th Party Congress. His third child, Svetlana, was born on February 28 that year.
1927: Zinoviev, Kamenev, and Trotsky were expelled from the party, leaving Stalin with the total control of the organization. The year saw the introduction of the 'five year plan' by Stalin.